/*
 * Copyright 2005-2025 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.openwms.core.lang;

/**
 * A ListExtractor.
 *
 * @param <K> Type of key
 * @param <V> Type of value
 * @author Heiko Scherrer
 */
public interface ListExtractor<K, V> {

    /**
     * From a list node of type {@code T} extract the key element.
     *
     * @param <T> Type of list node
     * @param listNode The node to extract the key from
     * @return the extracted key
     */
    <T> K extractKey(T listNode);

    /**
     * From a list node of type {@code T} extract the value.
     *
     * @param <T> Type of list node
     * @param listNode The node to extract the value from
     * @return the extracted value
     */
    <T> V extractValue(T listNode);
}